"R. Kannan" wrote in message
. net...
Hi,

Every year I get black spots on the leaves of Rudebeckia plants. Some of
the
leaves are turning yellow. I am presuming that these are effects of
insects/fungi and I have been spraying them with 'Ortho Insect and disease
control - Formula III'. I am not too sure if it is very effective. The
plants seem to thrive and flower every year though the leaves turn yellow
and eventually dark brown. Is there something else that can be done? I
ggogle and found someone else had the samne problem

http://www.icangarden.ca/forum.cfm?t...tthreadid=6470

but did not see any solutions posted.

TIA for any advice

It's just something that happens to Rudbeckia. Worse in some years than
others. It only upsets people, but doesn't kill the plant. Stop spraying
chemicals on them without having any idea what the cause is. Those chemicals
have never been, and never will be proven to be safe.